CN1020334C - Differential speed and equal torque squeezing mill - Google Patents

Abstract

The present invention relates to a squeezing mill with a new structure. A differential speed milling roller with equal torque in a shape of a truncated circular cone or a milling roller in a shape of a cambered revolving body is designed to cause materials not only to bear tremendous normal pressure from a milling roller but also to bear suitable shearing and milling force from the milling roller when milled by the squeezing mill so that milled products comprise a large amount of fine powder, and material layer milling effects are further improved. When used, the present invention not only can reserve all advantages of squeezing mills but also can replace a currently universal ball mill so that the system power consumption is reduced by 45%, the steel consumption is reduced by 80%, and the noise is reduced by 30 decibels.

Description

Differential speed and equal torque squeezing mill

The present invention is a kind of milling equipment, can be applicable to the comminution process of raw material, fuel and the finished product of cement, glass, ceramic industry, the comminution process of fragility ore in the mining processing industry.

" ore-dressing technique " that prior art can be published referring to West Germany (AUFBEREI-TUNGS-TECHNIK) in 1987 the tenth interim the 591st page to the 599th page.At present, the primary structure of squeezing mill (Roller Press) is, two equal and opposite in directions, structures are the grinding roller of cylindrical shape, be arranged together abreast, two grinding rollers have drive motors to do to rotate in opposite directions with speed by the reductor drive respectively, wherein, the axle of a grinding roller maintains static, and the axle of another grinding roller can move horizontally.During use, the axle that promotes to move horizontally by hydraulic means, use and produce huge pressure between grinding roller and the grinding roller, thereby make and be in two materials between the grinding roller and be squeezed fully broken, form laminar material cake, contain a large amount of fine powders in the material cake, and the material piece will produce many trickle slight cracks in pressurized process.Along with grinding roller continuous rotation, the material that is in grinding roller top constantly is drawn between two grinding rollers and is squeezed, thereby reaches the purpose of crushing and grinding.

Above-mentioned squeezing mill promptly mainly by the crush and grind effect, reaches the purpose of grinding, thereby has the mill efficiency height owing to use bed of material grinding principle, and series of advantages such as energy consumption is low, output height are constantly being promoted and used.On the other hand, because two grinding rollers of squeezing mill are with fast same torque motion, therefore, in grinding process, material is subjected to less than the shearing abrasive power from grinding roller, be reflected in the actual production, be exactly not have enough micro mists in the ground prod, thereby be difficult in cement industry and other industrial trade, replace ball mill fully, and to be used with equipment such as ball mills, make the technological process relative complex that becomes, energy consumption, steel consumption etc. can't drop to gratifying level, has caused the certain limitation of existing squeezing mill.

The objective of the invention is to provide a kind of novel extrusion grinding equipment.It is according to bed of material grinding principle, by improving the planform of squeezing mill grinding roller, make material can be subjected to suitable shearing abrasive power, contain enough micro mists in the material behind the extruding grinding, satisfy the grain composition requirement in cement products and other industrial products from grinding roller.And then make squeezing mill in cement industry or mining processing industry, and substituting ball mill fully as the finished product milling equipment, the while is the grinding pow consumption and the steel consumption of reduction system further, and improves operating environment, dust and noise pollution in cement industry or the mining processing industry.

The present invention is by finishing on the basis of existing squeezing mill grinding mechanism being done careful research.As everyone knows, the structure of two of existing squeezing mill grinding rollers is identical cylinders.When they rotated in opposite directions, the speed of action of the suffered grinding roller in bed of material both sides was identical, so grinding roller mainly is pure pressure to the active force of material.And shearing force only is to rely on the inner generation of the bed of material in common squeezing mill.Very little for normal pressure.It mainly is that this is difficult to realize in common squeezing mill by shearing force that but material is become micro mist by grinding.

The present invention is on the basis of above-mentioned analysis and make.In squeezing mill, for making grinding roller the bed of material is produced shearing force, just must make grinding roller different to the speed of action on bed of material both sides, promptly should there be speed difference between two grinding rollers.But,, make not only not reach the drive motors idle running of the grinding roller that rotating speed is low intended purposes, and bring another drive motors overload operation because the pressure that the bed of material transmitted is very big if make two roller speed differences of common squeezing mill.

The designed squeezing mill grinding roller of the present invention is the differential speed and equal torque grinding roller.Be that with the grinding roller difference of common squeezing mill two grinding rollers of the present invention exist local velocity poor at lapped face, but keep two grinding rollers still to bear identical moment of torsion.Simple proposal is the most, replaces common cylinder grinding roller, adopts the grinding roller that is frustum of a cone form.Two grinding rollers are still arranged in the parallel mode of axis, but the sensing of the small end of the frustum of a cone is just in time opposite.During practical application, consider the factor of axial force, generally each grinding roller all is made of by the opposite mode of orientation the even number frustum of a cone.When squeezing mill of the present invention turns round, keep the angular velocity of rotation of two grinding rollers still consistent, guaranteed that so just two grinding rollers have identical moment of torsion.But all there is speed difference to the speed of action on bed of material both sides in grinding roller in each part almost, and the radius of grinding roller differs general goal more, and speed difference is big more.Because there is speed difference in the lapped face of grinding roller of the present invention, promptly act on the speed of action difference on bed of material both sides, thereby grinding roller has produced tangible shearing abrasive power to the bed of material, cause containing in the ground prod of the present invention enough micro mists, improve the grain composition of ground prod, reached the purpose of efficient grinding.

Use the present invention to have following tangible advantage.At first, because the present invention has adopted bed of material grinding principle as common squeezing mill, therefore have whole advantages of common squeezing mill.Secondly, because there is speed difference in the crush and grind surface of grinding machine grinding roller to the speed of action of the bed of material, make material and except that being subjected to pure pressure, also be subjected to suitable shearing abrasive power, the feasible micro mist that generates through squeezing mill of the present invention, existingly, material generates by being exerted pressure, also have pair material to apply the shearing abrasive power and generate, usually, the every extruding through a squeezing mill of the present invention of material can produce the micro mist about 40%.So when squeezing mill of the present invention is used for pulverizing cement, the micro mist that 3～4 abundant μ m are arranged in the product, satisfy the grain composition requirement in the cement products, can substitute the finished product milling equipment of ball mill fully as cement industry or mining processing industry, simplify technological process, saved great amount of investment.The 3rd, from equipment itself, squeezing mill refers to the equipment of identical output than the light 40%(of ball mill), thus weight of equipment alleviated, saved steel consumption.Consume from the running of equipment, eliminated a large amount of liner plates, steel have further been saved in the consume of partition panel and abrasive media.The 4th, noise reduces greatly, has eliminated the strike note of steel ball (abrasive media) at ball milling fully.In sum, use the present invention, can make system's power consumption reduce by 45%, steel consumption reduces by 80%, and noise reduces 30dB.

Most preferred embodiment of the present invention can provide in conjunction with the following drawings.

Fig. 1 is a structure principle chart of the present invention.

Fig. 2 is the rearview of Fig. 1.

Fig. 3 is a kind of grinding roller structural upright schematic diagram of the present invention.

Fig. 4 is an another kind of grinding roller structural upright schematic diagram of the present invention.

Fig. 5 is the third grinding roller structural representation of the present invention.

At first referring to Fig. 1 and Fig. 2.Differential speed and equal torque squeezing mill of the present invention is to form common the transformation on the basis of torque squeezing mill with speed.In the mainframe 2 of squeezing mill, four bearing blocks 7 are installed, per two bearing blocks 7 are fixed a grinding roller 3 of the present invention.Wherein two bearing blocks can move horizontally, thereby make the grinding roller of being fixed by them 3, also can move horizontally.Two grinding rollers 3 are arranged in the mode that central shaft is parallel to each other.Each grinding roller is connected with a planetary reducer 5.Do to rotate in opposite directions by planetary reducer 5 drives two grinding rollers 3 of the present invention separately by two identical drive motors of specification.Grinding roller of the present invention by main hydraulic cylinder 8 pressurizations, makes the huge pressure of formation between two grinding rollers by hydraulic system 1.For squeezing mill of the present invention, as common squeezing mill, design has centralized lubrication station 4, and centralized lubrication station operated by rotary motion provides lubricated by oil pipe for each bearing block in the back of mainframe 2.Parallel stable with the grinding roller running for two grinding roller central axis that guarantee squeezing mill, planetary reducer 5 is fixedly mounted on the grinding roller 3.

Squeezing mill grinding roller 3 of the present invention is through well-designed.In order to make grinding roller produce suitable shearing abrasive power to material, grinding roller of the present invention does not adopt existing cylinder form.Fig. 3 has provided a kind of grinding roller structure, and this is the simple structure of grinding roller of the present invention, is actually the schematic diagram of differential speed and equal torque grinding roller.The shape of two grinding rollers all is the frustum of a cone, still keeps the central axis of two grinding rollers parallel during installation, and just the big end (or small end) of grinding roller points to opposite fully.When these two grinding rollers rotated in opposite directions with unequal angular velocity, clearly, they had identical moment of torsion.On the other hand, except that the identical part of diameter, each grinding roller and the adjoining part of another grinding roller, their linear velocity is all inequality.

Grinding roller shown in Figure 3 be in actual applications owing to can produce very big axial force to bearing block, thereby except that the grinding roller width can be used when very little, generally not really suitable.In order to eliminate the influence of axial force, the present invention recommends to adopt grinding roller shown in Figure 4.Grinding roller shown in Figure 4 is actually by grinding roller shown in two picture groups 3 and is superimposed by rightabout, and two grinding rollers have four frustum of a cones and constitute.When big (when the height of the cone of abscissusing is higher), for the vary in diameter that makes grinding roller is unlikely to very big, the present invention also designs grinding roller shown in Figure 5 for squeezing mill grinding roller width, and this is actually by grinding roller shown in Figure 4 and is being constituted through stack institute once.In general, grinding roller of the present invention carries out structure shown in Figure 3 several times stacks exactly and constitutes, and is to eliminate axial force, recommends to adopt even number time stack.

The inclination angle of grinding roller of the present invention, promptly the angle between frustum of a cone bus and frustum of a cone axis should be limited in and be not more than 35 ° and be advisable, to adapt to the grain composition needs of ground prod.On the other hand, for making the micro mist that contains q.s in the ground prod, the inclination angle also should not be less than 5 °.

Discover that the said structure form is to realize the grinding roller optimised form of differential speed and equal torque, but is not unique form.For example, be the rotation body structure of bus with a curve about the mid point of curve symmetry, just can be used for making grinding roller, during installation with reference to the mounting means of frustum of a cone grinding roller, central axes, but opposite orientation.Consider the factor of eliminating axial force, the grinding roller that also grinding roller of this structure can be similar to frustum of a cone structure superposes.

Owing to there is speed difference, roller surface wearing and tearing of the present invention become a major issue.Studies show that the wearing and tearing of grinding roller mainly are that it is severe more to wear and tear because there are relative velocity in the bed of material and roller surface, and relative velocity is big more.Ways of addressing this issue is to make (as using built-up welding) some strips or netted burr at roller surface, and that a part of bed of material relative velocity that makes roller surface and its close contact is zero.

During use, material is discharged into above two grinding rollers of squeezing mill from squeezing mill feed arrangement 6 of the present invention, because the rotation in opposite directions of grinding roller 3, material is drawn between two grinding rollers, be subjected to huge extruding, shear action, produce bed of material grinding effect, make material be become qualified finished product by grinding from grinding roller.

Claims (7)

1, a kind of differential speed and equal torque squeezing mill, form by mainframe 2, bearing block 7, feed arrangement 6, main hydraulic cylinder 8, hydraulic system 1, centralized lubrication station 4, planetary reducer 5 and drive motors etc., bearing block 7 is installed in the mainframe 2, per two bearing blocks 7 are fixed a grinding roller 3, two grinding rollers 3 arrange that in the central shaft mode of being parallel to each other each grinding roller is connected with a planetary reducer 5 and is driven grinding roller and two grinding rollers are rotated in opposite directions by planetary reducer by drive motors; By main hydraulic cylinder 8 pressurizations, centralized lubrication station 4 provides lubricated by oil pipe for each bearing block 7 to grinding roller by hydraulic system 1, and material is by between two grinding rollers of feed arrangement 6 feedings; It is characterized in that the grinding roller of squeezing mill adopts the rotation body structure of two sizes, the identical frustum of a cone of shape or particular curves, during installation, the central axis of two frustum of a cones is parallel to each other, but the small end of two grinding rollers points to antithesis.

2, squeezing mill as claimed in claim 1 is characterized in that the gradient of grinding roller, and promptly the angle of the central axis of the frustum of a cone and bus is advisable with 5～35 °.

3, squeezing mill as claimed in claim 1 or 2 is characterized in that, the grinding roller of each squeezing mill can use two frustum of a cone structures to constitute, and one of them grinding roller is small in ends, broad in the middle, and another grinding roller is that two ends are big, middle little.

4, squeezing mill as claimed in claim 1 or 2, it is characterized in that, the grinding roller of each squeezing mill, can use four frustum of a cone structures to constitute, each frustum of a cone and the adjacent frustum of a cone combine by the small end directed in opposite, and each frustum of a cone of each grinding roller, with the corresponding truncate circular cone of another grinding roller, their small end points to also opposite.

5, squeezing mill as claimed in claim 1, it is characterized in that, the grinding roller of each squeezing mill, can use several frustum of a cone structures to constitute, generally constitute with even number frustum of a cone structure, each frustum of a cone and the adjacent frustum of a cone combine by the small end directed in opposite, and each frustum of a cone of each grinding roller, with the corresponding truncate circular cone of another grinding roller, their small end points to also opposite.

6, squeezing mill as claimed in claim 1 is characterized in that, the grinding roller of squeezing mill, also can adopt about in point-symmetric curve be the rotation body structure of bus, and be similar to frustum of a cone structure, grinding roller can use several rotary bodies stacks to constitute.

7, squeezing mill as claimed in claim 1 or 2 is characterized in that, is manufactured with some strips or netted burr in methods such as the surface of squeezing mill grinding roller use built-up welding.

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